Influence of non-uniform passing speed distribution on rail wear evolution in the curved section of Metro

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (14) : 41-49.

GAO Ya1，SHI Jin1，JIAO Binyang2，YANG Fei3

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Abstract

Based on the trigonometric probability distribution, the influence of the uniformity of speed distribution on the rail wear evolution of curved track is studied. The Archard material wear model and non-Hertz rolling contact theory based on virtual penetration are used to predict rail wear; a vehicle and track dynamic interaction model on curve is established to calculate the rail wear under different running speeds by weight accumulation, and the worn rail profile is smoothed by B-spline function. The evolution of rail wear of Metro B-type vehicles passing through the curved steel spring floating plate section with single speed and non-uniform speed is compared and analyzed. Results show that the rail wear is larger on the circular curve, and the rail wear band is basically straight along the longitudinal direction of the track, while the wear depth is unevenly distributed; with the increase of rail profile updating times, the range of rail wear region increases gradually, and the rail wear speed first increases and then decreases; the non-uniform speed can effectively improve the rail wear uniformity and slow down the rail wear rate. Compared with single speed and worn rail profile, the cumulative number of vehicles passing is nearly doubled when non-uniform speed passing and optimized rail profile are used after updating for 10 times, which significantly slows down the rail wear rate of curve section and greatly increases the vehicle running stability; In the actual operation of metro, the rail wear rate can be reduced to a certain extent by adopting the non-uniform speed control mode in the peak and low peak periods.
Keywords: metro; non-uniform speed distribution; wear prediction; steel-spring floating slab; dynamic response; curve negotiation

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metro / non-uniform speed distribution / wear prediction / steel-spring floating slab / dynamic response / curve negotiation

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GAO Ya1，SHI Jin1，JIAO Binyang2，YANG Fei3. Influence of non-uniform passing speed distribution on rail wear evolution in the curved section of Metro[J]. Journal of Vibration and Shock, 2022, 41(14): 41-49

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